that happened to my wagon recently... bought new batt, but the light still was on and vanished when revved. Almost bought a surplus alternator to fix it, but in the end it was the mating of the terminal at the back of the alternator. Had the terminal replaced and rewired... all is well now.

__________________
Mike

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1975 200 - Sold (no pix);
1978 200 - Sold - http://www.pbase.com/hboy/redbaron
1979 300TD - Sold
http://www.pbase.com/hboy/greenwagon
http://www.geocities.com/hboy726/300TD.html
1985 230E - now my daily driver...